Results 51 to 60 of about 85,552 (296)

Hydrogen-triggered X-Ray Bursts from SAX J1808.4−3658? The Onset of Nuclear Burning

The Astrophysical Journal, 2023
We present a study of weak, thermonuclear X-ray bursts from the accreting millisecond X-ray pulsar SAX J1808.4−3658. We focus on a burst observed with the Neutron Star Interior Composition Explorer on 2019 August 9, and describe a similar burst observed ...
Sierra Casten, Tod E. Strohmayer, Peter Bult   +2 more
doaj   +1 more source

JET MODELS FOR NEUTRON STAR X-RAY BINARIES

International Journal of Modern Physics: Conference Series, 2012
A variety of different models for jet formation have been developed over the years (mainly) for black hole systems and young stellar objects. Conclusive observational constraints which would favor one particular mechanism are difficult to obtain.
Migliari, S., Ghisellini, G., Miller-Jones, J., Russell, D.   +3 more
openaire   +3 more sources

Al–Cu Composite Casting of Laser‐Deoxidized Copper: Bonding, Interfacial Chemistry, and Thermal Conductivity

Advanced Engineering Materials, EarlyView.
This study investigates laser‐based oxide removal of Cu inserts in oxygen‐free conditions and examines long‐term oxidation kinetics and surface chemistry under different atmospheres via X‐ray photoelectron spectroscopy. Al–Cu compound casting with differently oxidized surfaces is performed, and intermetallic phase formation, morphology, and thermal ...
Timon Steinhoff, Finn‐Lennard Janthur, Sascha Zimmermann, Sarah Seffer, Jörg Hermsdorf, René Gustus, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Christian Klose   +9 more
wiley   +1 more source

Discovery of a New Phase-transient Cyclotron Line in A0535+26: Constraints on the Accretion Geometry

The Astrophysical Journal
In 2020 November, A0535+26 underwent one of its brightest outbursts, reaching nearly 12 Crab in X-ray flux. Observed by Insight-HXMT, NuSTAR, NICER, and AstroSat, this event provided valuable insights into Be/X-ray binaries.
Ashwin Devaraj, Biswajit Paul, Varun Bhalerao, Dipanjan Mukherjee   +3 more
doaj   +1 more source

Donor Stars in Black Hole X‐Ray Binaries [PDF]

The Astrophysical Journal, 1999
We study theoretically the formation of black-hole (BH) X-ray binaries. Consistency of the models with the observed relative numbers of systems with low-mass (<2 M_sun) and intermediate-mass (~2 M_sun - M_{BH}) donors leads to severe constraints on the evolutionary parameters of the progenitors.
openaire   +2 more sources

Formation of Ultracompact X-Ray Binaries in Dense Star Clusters [PDF]

The Astrophysical Journal, 2005
Bright, ultracompact X-ray binaries observed in dense star clusters, such as Galactic globular clusters, must have formed relatively recently, since their lifetimes as persistent bright sources are short (e.g., ~10^8 yr above 10^36 erg/s for a 1.4 Msun neutron star accreting from a degenerate helium companion with an initial mass of ~0.2 Msun ...
Ivanova, N., Rasio, F. A., Lombardi, Jr., J. C., Dooley, K. L., Proulx, Z. F.   +4 more
openaire   +2 more sources

The conspicuous absence of X-ray emission from carbon-enriched Wolf-Rayet stars [PDF]

, 2003
The carbon-rich WC5 star WR 114 was not detected during a 15.9 ksec XMM-Newton observation, implying an upper limit to the X- ray luminosity of L-X less than or similar to 2.5 x 10(30) erg s(-1) and to the X-ray to bolometric luminosity ratio of L- X/L ...
A. M. T. Pollock, Berghöfer, Cassinelli, Castor, Chapman, Coker, Corcoran, Feldmeier, Feldmeier, Figer, Gaensler, Gayley, Gehrels, Groenewegen, Gräfener, Hamann, Harnden, Hasinger, Ignace, Ignace, Ignace, J. C. Brown, Jansen, Kahn, Kitamoto, Kudritzki, L. M. Oskinova, Lamb, Lucy, Lucy, Massey, Owocki, Owocki, Pallavicini, Pollock, Pollock, R. Ignace, Runacres, Schulz, Seward, Skinner, Skinner, Skinner, Smith, Stevens, Tanaka, Torres, Usov, Vacca, van der Hucht, W.-R. Hamann, Waldron, Watson, Wessolowski, Williams, Woosley, Zhekov   +56 more
core   +3 more sources

Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May, Finn‐Lennard Janthur, Lena Kreie, Michael Müller, Sarah Seffer, Nick Schwarz, Jörg Hermsdorf, Thomas Hassel, Stefan Kaierle, Ludger Overmeyer   +9 more
wiley   +1 more source

XMM-Newton View of Pulsating Iron Fluorescent Emission from Centaurus X-3

The Astrophysical Journal
Centaurus X–3 (Cen X–3) is a bright, high-mass X-ray binary pulsar. We present a pulse phase–resolved X-ray spectral analysis of data from an archival XMM-Newton observation of Cen X–3 taken during the high state of the source.
Kinjal Roy, Hemanth Manikantan, Biswajit Paul   +2 more
doaj   +1 more source

Low-level accretion in neutron star X-ray binaries [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
We search the literature for reports on the spectral properties of neutron-star low-mass X-ray binaries when they have accretion luminosities between 1E34 and 1E36 ergs/s. We found that in this luminosity range the photon index (obtained from fitting a simple absorbed power-law in the 0.5-10 keV range) increases with decreasing 0.5-10 keV X-ray ...
Wijnands, R., Degenaar, N., Armas Padilla, M., Altamirano, D., Cavecchi, Y., Linares, M., Bahramian, A., Heinke, C.O.   +7 more
openaire   +6 more sources